초록 ▼

A method for heating and press-forming a plied material sheet prepared by impregnating a thermosetting resin into sheets of parallely disposed plastic fiber or into sheets of woven fabric of plastic fiber. The material sheet is formed into an operation which repeats the steps of heating and press-fo

A method for heating and press-forming a plied material sheet prepared by impregnating a thermosetting resin into sheets of parallely disposed plastic fiber or into sheets of woven fabric of plastic fiber. The material sheet is formed into an operation which repeats the steps of heating and press-forming such material sheet within a shaping mold on a heating and press-forming apparatus for a predetermined time period and then releasing the pressure for a predetermined time period while step-feeding the material sheet over a predetermined distance for a time period less than the time period of such released pressure.

대표청구항 ▼

A method of longitudinally forming plastic composite continuous strip material into press formed structural shapes longitudinally along said strip material, said structural shapes having substantially identical uniform cross-sections in planes perpendicular to the longitudinal axis of said plastic c

A method of longitudinally forming plastic composite continuous strip material into press formed structural shapes longitudinally along said strip material, said structural shapes having substantially identical uniform cross-sections in planes perpendicular to the longitudinal axis of said plastic composite continuous strip material, which comprises: (a) longitudinally feeding said continuous strip of plastic composite material through shaping means to longitudinally shape said continuous strip and feeding said continuously shaped continuous strip to a heating and press-forming apparatus in longitudinal alignment with said continuous strip in a length to at least longitudinally cover said longitudinally aligned heating and press-forming apparatus with said continuous strip; (b) after said heating and press-forming apparatus is covered with said continuous strip, stopping said continuous strip for a predetermined time period; (c) after said continuous strip is stopped and during said predetermined time period, simultaneously heating and press-forming said predetermined length of said plastic composite material covering said heating and forming apparatus into said structural shape; (d) releasing pressure from said plastic composite material formed into said structural shape after said predetermined time period for a time period T2; and longitudinally feeding said continuous strip of plastic composite material stepwise for a period T3 while said pressure is released from said plastic composite material, said period T3 being less than said period T2 and repeating steps (a) to (d) to obtain a continuous longitudinal pressure formed structural shape longitudinally along said continuous strip material.